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. 2019 May 14;24(10):1854. doi: 10.3390/molecules24101854

Table 2.

Main chemical structures of the phenolic compounds found in the Cucurbita spp.*.

Compound Name Synonym(s) Empirical Formula Structure References
Protocatechuic acid 3,4-Dihydroxybenzoic acid C7H6O4 graphic file with name molecules-24-01854-i001.jpg [52]
http://phenol-explorer.eu/compounds/412
p-Hydroxybenzoic acid 4-Hydroxybenzoic acid C7H6O3 graphic file with name molecules-24-01854-i002.jpg [52]
http://phenol-explorer.eu/compounds/418
p-Hydroxybenzaldehyde 4-Hydroxybenzaldehyde C7H6O2 graphic file with name molecules-24-01854-i003.jpg [52]
http://phenol-explorer.eu/compounds/725
Vanillic acid 4-Hydroxy-3-methoxybenzoic acid; p-Vanillic acid C8H8O4 graphic file with name molecules-24-01854-i004.jpg [52]
http://phenol-explorer.eu/compounds/414
Caffeic acid 3,4-Dihydroxycinnamic acid C9H8O4 graphic file with name molecules-24-01854-i005.jpg [52]
http://phenol-explorer.eu/compounds/457
Syringic acid 3,5-Dimethoxy-4-hydroxybenzoic acid C9H10O5 graphic file with name molecules-24-01854-i006.jpg [52]
http://phenol-explorer.eu/metabolites/420
trans-p-coumaric acid trans-4-Hydroxycinnamic acid C9H8O3 graphic file with name molecules-24-01854-i007.jpg [52]
http://phenol-explorer.eu/compounds/454
Ferulic acid 3-Methoxy-4-Hydroxycinnamic acid; 3-Methylcaffeic acid; Coniferic acid C10H10O4 graphic file with name molecules-24-01854-i008.jpg [52]
http://phenol-explorer.eu/compounds/459
trans-sinapic acid trans-4-Hydroxy-3,5-dimethoxy-cinnamic acid; trans-Sinapinic acid C11H12O5 graphic file with name molecules-24-01854-i009.jpg [52]
http://phenol-explorer.eu/compounds/464
Tyrosol p-HPEA; 4-(2-Hydroxyethyl)phenol; 2-(4-Hydroxyphenyl)ethanol; 2,4-Hydroxyphenyl-ethyl-alcohol; 4-Hydroxyphenylethanol C8H10O2 graphic file with name molecules-24-01854-i010.jpg [52]
http://phenol-explorer.eu/compounds/673
Vanillin 4-Hydroxy-3-methoxy-benzoic aldehyde; Methylprotocatechuic aldehyde; Vanillic aldehyde; p-Vanillin C8H8O3 graphic file with name molecules-24-01854-i011.jpg [52]
http://phenol-explorer.eu/compounds/724
Luteolin 5,7,3′,4′-Tetrahydroxyflavone C15H10O6 graphic file with name molecules-24-01854-i012.jpg [52]
http://phenol-explorer.eu/compounds/229
Kaempferol 3,5,7,4′-Tetrahydroxyflavone C15H10O6 graphic file with name molecules-24-01854-i013.jpg [52]
http://phenol-explorer.eu/compounds/290

* The data were collected from the Phenol-Explorer database, which is an online comprehensive database on polyphenol contents in foods, http://phenol-explorer.eu/ (Accessed on 09.12.2018).